There are three mol-ecules in the asymmetric unit of the title compound, C(23)H(26)O(7), in which the dihedral angles between two benzene rings are 4.34 (9), 18.11 (8) and 8.54 (8)°. The central penta-1,4-dien-3-one fragment makes dihedral angles of 3.95 (9) and 3.32 (16)° with the two adjacent benzene rings in one mol-ecule, whereas the corresponding pairs of angles in the other two mol-ecules...

In the title mol-ecule, C(9)H(9)N(3)O(5), the dihedral angle between the mean planes of the amide group and the benzene ring is 31.24 (14)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules to form one-dimensional chains propagating in [100].

Two independent mol-ecules (A and B) comprise the asymmetric unit of the title compound, C(26)H(28)ClN, with the inverted form of B almost superimposable upon A. Each piperidine ring has a chair conformation and the chloro substituent is anti to the piperidine N atom. Each of two aromatic rings, the benzyl residue and one methyl group substituents occupies an equatorial position, and the second...

In the title mol-ecule, C(18)H(11)FN(2)O(4), the fused four- ring system is essentially planar, with an r.m.s. deviation of 0.032 Å. In the crystal, mol-ecules are connected by π-π stacking inter-actions [centroid-centroid distances = 3.5684 (9) and 3.8247 (9) Å] into chains along [100].

There are two mol-ecules in the asymmetric unit of the title compound, C(4)H(13)NO(2)SSi. In the crystal, mol-ecules are linked via inter-molecular N-H⋯O hydrogen bonds, forming chains along [001]. The crystal studied was an inversion twin, the refined ratio of twin domains being 0.61 (9):0.39 (9).

The asymmetric unit of the title compound, C(19)H(22)ClNO, contains two independent mol-ecules in which the dihedral angles between the aromatic rings are 76.45 (9) and 74.69 (9)°. An intra-molecular O-H⋯N hydrogen bond occurs in each mol-ecule. The crystal structure features weak C-H⋯π inter-actions.

The title compound, C(9)H(9)FN(2)O, was prepared by the reaction of 4-fluoro-benzophenone and acethydrazide. In the mol-ecule, all non-H atoms are essentially coplanar [r.m.s. deviation = 0.065 (2) Å]. In the crystal, mol-ecules are linked into centrosymmetric dimers by pairs of inter-molecular N-H⋯O hydrogen bonds.

This study examined the ability of the synthetic mordenite nanocrystal to remove Tl(III) and As(III) from an aqueous solution. The determination of the concentration changes of H+ and OH- quantities in the acidic (pH 3) and alkali (pH 9) treated mordenite nanocrystals were done by the potentiometric titration curves. The maximum uptake capacities (Qmax) of these metal ions using the mordenite i...

Urea forms a 1:1 solvate with N,N-dimethyl-acetamide (DMA) [systematic name: diamino-methanal-N,N-dimethyl-acetamide (1/1), C(4)H(9)NO·CH(4)N(2)O] with both mol-ecules positioned on a twofold axis, giving rise to rotational disorder of the DMA mol-ecule. The mol-ecules display a layered structure in which urea mol-ecules form hydrogen-bonded ribbons bounded by mol-ecules of solvent.